Telephone set



a. SYMES.

TELEPHONE SET.

APPLICATION FILED nov. a. nus.

1,327,500. Patented Jan. 6,1920.

.wlim m y W W:

Be itknowvn that 1, Humor S Y aiicaa t i Hi M j sty the King of GreatvBrit-1 hereby. d lw hat th i Salinas matic callin 7 nished withadditional contacts.

ain, residing at 91 Princes street in the city ofDunedin, in the BritishDomin onof new Zea-land, have invented certain new andus hone S ts, and3 ful Improvements in Tele Que es 18 a eenaid tie w i t B to which itappertains to make and usethe such aswill enable ot sskilled Theinstrument containin 7 g V rheostat or obtaining therequired voltage,

a condenser, and the usual induction coils,

with a five way jack for connecting by a five way plug and the usual flexible cord with five wires to the telephone, which consists of amicro-transmitter receiver, and an auto; device, and controlledby theusual central switch, which however is fur- The telephone may rest onfixed supports, eitheron the bell-box or otherwise as preferred.

v Referring to the accompanying drawing Figure 1 is a diagram'cf theunlts within the i I bell-hex, andFig. 2, is a diagram of the 00 1-1tacts and connections the telephone showing the central swi hill its,normal position. Fig. 3 is a plan view of the type ofautg matic callingdevice I prefer to use, and F g."

4 is part side elevation and part section of the telephone, showing itin normalpositionf when in use, with the central switeh'liept partly(but not fully,) down by adevice'to: be explained. A is the automaticcalling device, shown on plan in Fig. 3, side arses: tion in Fig. 4;,and back with inseam removed, in Fig. 2, showing thearm Afi gtj the endof the usual spindle A that tarts when theiliall ii is turned forcalling, and automatically cuts out the receiver when calling,reconnecting same when the said call is finished, by closingthesprincontacts A hen the dial is operate, as in the act of calling asubscriber, as shown by Fig. 2, the said arm is moved away from thecontact A, and the latter being yielding or of spring character willbreak the circuit because the spring contacts A are, under theseconditions, permitted to separate, and when the dial is restored tonormal position, the contacts A are caused to become engaged, therebyrestoring the circuit for calling purposes. This feature of improvementis parconsists of a small the usual bell-set, an adjustable HENRY smnaornunnnrn, new zzeneannsash s am. c.1920. si'iiwii ipbaazff ticularlyadvantageous in eliminatin noises during the operation of calling. isthe usuahbell-set, B the bell connection for cutting out the bell whenneeded, and automatically connecting up when the switch is inits normalposition, see Fig. 2. switch is pressed, the bell is cut off, see Fig.4." "G 'isthe condenser, I theu'sual induction coils L. L the usuallines to the exchange,

L I? line connectionwithin the telephone,

P the 'rimarjf' connection Within the telephone, the rhcostat, R is theusual receiver, R is a variable resistance device, overned by a'lev cr,(not shown,) for obtain- Ing the desired voltage, which may thus beincreased 'to combat indistinctness arising from. distance orunfavorable weather conditions. R is a connection from the receiver thetelephone. S is the central switch insulated as usual along its upperedge. T is themicro-transmitter, of preferred sanitary typeas shown.

The several'circuits are defined as follows:

'BeZZ circuit-Normally the cam in the automatic caller A presses on thecontact A closing the same, but the circuit is not coinplete 111 Viewoi? the 'fact that the variable resistance controlling device R isopenor the circuit is incomplete therethrough. When receiving, thecontact A is closed and the currentpas's'es through the secondar coil inthe usual :manner and also through the condenser, the bell wire in thiscircuit bein utilized through the jack 5. When spea ring, the circuit isthrough the primary coil. the proper reduced voltage being extractedfrom the rheostat and in this instance also the sen wire isutilizedthrough the jack It will be understood that the jacks 4 and provide forthe'rnaking of, circuit ways and by utilizing the 'h length,1tispoc's'ibleto gash of the comma tions or circuits for the various workingcharacteristics of the instrument. It 'must b'eiloorne in mind that thecontact A is alwayircl'osed except when a call is made when it is inposition as shown, the said contact being fixed to the spindle ot' themoving ring shown in Fig. 3, which in practice is numbered. Should theuser wish to speak to others in his room, and not be heard at the otherend of the wire and still hold the exchange, the transmitter has only tobe tilted slightly forward so that the sliding weight W falls over thepoint of the switch, see

Fig. 4:. This breaks the primary circuit as \Vhen t lle 7 p ell' wirefor a portion of its shown, while by taking up the telephone the weightdrops away automatically when the switch is again pressed. The releasingof the switch, S disconnects the telephone from the exchange when it isthen ready for another connection. The line circuit is not,

broken when the sliding weight W allows the speaking contact to break atP and it takes in the whole rheostat. The release of the weight W whentaking up the hand set for use is accomplished by pressing on the switchS, this latter action allowing the weight W to fall away.

It will be seen that the weight \V does not hold the switch Ssufiiciently down to connect at P while it is sufliciently down todisconnect at B It will also be seen that only one hand is necessary touse this telephone. In this in vention any suitable materials or sizesmay be adopted.

The particular novel features in this improvement are that the parts newordinarily scrapped because they cannot take the higher currents of theautomatic system are used by merely abstracting the necessary voltageneeded for these ordina scrapped parts which are of low voltage From thecoil R at B Moreover, in the present instance the automatic callingdevice or caller on the receiver which is of well-known form has acompact arrangement relatively to the remaining parts of the telephoneset and also permits t e use in connection therewith of wires of thereceiver on which the said caller is disposed that are usually dead,thereby savin many connections that would otherwise e necessary. Whenspeakin the bell wires are dead, and after use 0 the telephone it willbe understood that the said wires become active or are charged and aliveready for service. The transmitting and receiving elements disclosed areof the class not now admissible in automatic work, but, when connectedto the coil R at R, the said transmitting and receiving parts arerendered practically operative and great saving in the use of telephoneelements results.

Having now described the invention I desire a patent of the UnitedStates of America for 1. In a telephone of the class specified adaptedfor automatic telephone work, the combination with an automatic callingdevice and a transmitter and receiver mounted on and embodied in theorganization of the same, of a bell set, a condenser, an adjustablerheostat, and induction coils all electrically connected to said callingdevice and the transmitter and receiver, and a switch associated with aweight device automatically movable to press one end of the switch andreleased for gravitating action by the switch to control t e operationof said telephone parts and also to cut off the bell set when receivingmessages, the weight device also being automatically operative to causesounds to pass the user of the telephone when the latter drops away uponresumption of the latter for use in talking purposes.

2. In a telephone of the class specified adapted for automatic service,the combina tion with a transmitter and receiver, of an automaticcalling device mounted on the receiver and operative to cut off thelatter while calling and also to automatically reconnect the saidreceiver when the calling is finished, a bell set, a condenser, arheostat, and induction coils all electrically connected to thetransmitter and receiver and calling device, and a switch having anautomatic device cooperating therewith for controlling the operation ofthe several elements.

3. In a telephone of the class specified, the combination with atransmitter and receiver and an automatic calling device mounted on thereceiver and operative to cut ofi' the receiver when a call is beingmade, of a bell set, a condenser, an adjustable rheostat, and inductioncoils electrically connected up to the receiver, transmitter and callingdevice for actuation during the several telephone operations, and acentral switch having a sliding weight operative in relation to one endthereof to maintain connection with an exchange and released by theactuation of the switch, the said sliding weight slipping away from theend of the switch when the telephone instrument is used for talkingpurposes.

In testimony whereof, I have hereunto set my hand in presence of twosubscribing witnesses.

HENTON MACAULAY DAVEY, J. T. HAEBER.

